<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>沿环形路径平移的动画</title>
    <style>
        @keyframes spin {
            to {
                transform: rotate(1turn);
            }
        }
        .avatar {
            animation: spin 3s infinite linear;
            transform-origin: 50% 150px;
        }
        .avatar > img {
            animation: inherit;
            animation-direction: reverse;
        }

    
        /* Anything below this is just styling */
        .avatar {
            width: 50px;
            margin: 0 auto;
            border-radius: 50%;
            overflow: hidden;
        }
        .avatar > img {
            display: block;
            width: inherit;
        }
        .path {
            width: 300px;
            height: 300px;
            padding: 20px;
            border-radius: 50%;
            background: #fb3;
        }
    </style>

</head>
<body>
     <div class="path">
         <div class="avatar">
            <img src="http://lea.verou.me/book/adamcatlace.jpg"/>
        </div>
     </div>
</body>
</html>